He made the comments as part of a press conference in Germany, where the ex-chief was supporting an event for the right-wing Alternative for Germany party.

Mr Farage also spoke at a rally held by the anti-immigrant party in Berlin this afternoon.

And he was invited there by Beatrix von Sturch, a granddaughter of Hitler's finance minuter Lutz von Krosigk.

She is a part of Mr Farage's grouping in the European Parliament after she was kicked out of a more mainstream one last year when she called on guards to use firearms to deter illegal immigrants - remarks she later said were a "mistake".

He described her as a "decent" person who wanted what was "best for her country".

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"If she doesn't do those two things - doesn't get some sense of order back into her own party and direction back into where the negotiations are going then I think the whispering campaign will go from something that is being done in private to being done in public and she might not last til Christmas," he said.

He also aimed squarely at the EU Commission President Jean Claude Juncker.